Convert `len' bytes from utf8 to characters. - Java java.lang

Java examples for java.lang:String UTF

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Description

Convert `len' bytes from utf8 to characters.

Demo Code

/*//  w w w.ja  va  2 s. c o  m
 * Copyright 2013 Alexander Shabanov - http://alexshabanov.com.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;

public class Main {
    /**
     * Convert `len' bytes from utf8 to characters.
     * Parameters are as in {@see System#arraycopy}
     * @param src       The array holding the bytes to convert.
     * @param srcIndex  The start index from which bytes are converted.
     * @param dst       The array holding the converted characters.
     * @param dstIndex  The start index from which converted characters are written.
     * @param len       The maximum number of bytes to convert.
     * @return First index in `dst' past the last copied char.
     */
    public static int utfToChars(byte[] src, int srcIndex, char[] dst,
            int dstIndex, int len) {
        int i = srcIndex;
        int j = dstIndex;
        int limit = srcIndex + len;
        while (i < limit) {
            int b = src[i++] & 0xFF;
            if (b >= 0xE0) {
                b = (b & 0x0F) << 12;
                b = b | (src[i++] & 0x3F) << 6;
                b = b | (src[i++] & 0x3F);
            } else if (b >= 0xC0) {
                b = (b & 0x1F) << 6;
                b = b | (src[i++] & 0x3F);
            }
            dst[j++] = (char) b;
        }
        return j;
    }
}

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